Which immunoglobulin is predominantly found in mucosal secretions?

Study for the Manor Preboards Module 2 Test. Use flashcards and multiple choice questions that include hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

Which immunoglobulin is predominantly found in mucosal secretions?

Explanation:
Secretory IgA is the antibody type that predominates at mucosal surfaces. It is produced by plasma cells in the mucosa as a dimer linked by a J chain and transported across epithelial cells by the polymeric Ig receptor. As it reaches the lumen, part of the receptor remains with the IgA as the secretory component, which protects it from proteases and helps it stay active in secretions. This form of IgA is well suited to mucosal defense, neutralizing pathogens and toxins and preventing their attachment to the mucous membranes. Other isotypes like IgG are mainly in the blood and tissues outside secretions, IgM can be present but is not the dominant mucosal antibody, and IgE functions primarily in allergic responses and defense against parasites rather than mucosal secretion.

Secretory IgA is the antibody type that predominates at mucosal surfaces. It is produced by plasma cells in the mucosa as a dimer linked by a J chain and transported across epithelial cells by the polymeric Ig receptor. As it reaches the lumen, part of the receptor remains with the IgA as the secretory component, which protects it from proteases and helps it stay active in secretions. This form of IgA is well suited to mucosal defense, neutralizing pathogens and toxins and preventing their attachment to the mucous membranes. Other isotypes like IgG are mainly in the blood and tissues outside secretions, IgM can be present but is not the dominant mucosal antibody, and IgE functions primarily in allergic responses and defense against parasites rather than mucosal secretion.

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